Lecture - Ann Arbor Earth Science

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Lecture - Ann Arbor Earth Science

Unconformities

Movements of Earth’s crust can lift up rock layers

that were buried and expose them to erosion.

Then, if sediments are deposited, new rock layers

form in place of the eroded layers. The missing

rock layers create a break in the geologic record

in the same way that pages missing from a book

create a break in a story.

*A break in the geologic record is called an

unconformity. An unconformity shows that

deposition stopped for a period of time, and rock

may have been removed by erosion before

deposition resumed.

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